Download Button Restrictions

I have an issue as my site has over 15,000 posts and each post contains a download button. The issue is that this download button is not located within the post itself. I am needing a way to use the existing button without having to create a whole new button within the post and having to go over each product one by one. Has anyone had this same issue? Can anyone know how to fix this issue? Any advice would help thanks.

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